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Martin Hope
mature
Asked: 2020-12-16 09:14:32 +0800 CST
  • 1

硬件A：Ubuntu 20.04 (192.168.1.61)：安装 VNC 服务器并将 OpenVPN 客户端配置添加到一些远程服务器C。

硬件B：MacOS 11.1 (192.168.1.51)：标准预装 VNC 客户端。

当OpenVPN 断开连接时，从B到A我有完美的 VNC 连接。但是当从A（作为客户端）连接到 OpenVPN 服务器时，VNC 连接立即断开。同时，(A <-> B) 和(A <-> B) 工作完美，并且具有与断开连接的 OpenVPN 相同的行为（仅关闭 VNC）。smbpingtraceroute

从B到A（有和没有 VPN）：

% traceroute 192.168.1.61
traceroute to 192.168.1.61 (192.168.1.61), 64 hops max, 52 byte packets
 1  192.168.1.61 (192.168.1.61)  27.855 ms  2.296 ms  35.563 ms

从A到B（有和没有 VPN）：

$ traceroute 192.168.1.51
traceroute to 192.168.1.51 (192.168.1.51), 64 hops max, 52 byte packets
 1  192.168.1.51 (192.168.1.51)  27.855 ms  2.296 ms  35.563 ms

为什么当 OpenVPN 客户端连接到 VNC 服务器时 VNC 不起作用以及如何绕过此行为？我需要将 VNC 服务器连接到 OpenVPN 网络，并且不要同时丢失 VNC 连接。

networking vnc openvpn tightvncserver
Martin Hope
mature
Asked: 2019-07-12 11:58:07 +0800 CST
  • 5

问题：MFU 像打印机一样工作，但不像扫描仪那样工作。

从developers.hp.com 安装了最新的HPLIP 版本：3.19.6。

:~$ hp-setup

惠普设置


hp-doctor命令输出：

------------------------------
| DISCOVERED SCANNER DEVICES |
------------------------------

No Scanner found.

--------------------------
| DISCOVERED USB DEVICES |
--------------------------

No devices found.

---------------------------------
| INSTALLED CUPS PRINTER QUEUES |
---------------------------------


HP-LaserJet-Pro-MFP-M125ra
--------------------------
Type: Unknown
Device URI: usb://HP/LaserJet%20Pro%20MFP%20M125ra?serial=CNB7GCJHZQ&interface=1
PPD: /etc/cups/ppd/HP-LaserJet-Pro-MFP-M125ra.ppd
warning: Failed to read /etc/cups/ppd/HP-LaserJet-Pro-MFP-M125ra.ppd ppd file
PPD Description: 
Printer status: printer HP-LaserJet-Pro-MFP-M125ra is idle.  enabled since Чт 06 июн 2019 17:54:40
warning: Printer is not HPLIP installed. Printers must use the hp: or hpfax: CUPS backend for HP-Devices.


--------------
| PERMISSION |
--------------

error: Unsupported model: HP_LaserJet_Pro_MFP_M125ra


Checking Permissions....


Checking for Configured Queues....
warning: Fail to read ppd=/etc/cups/ppd/HP-LaserJet-Pro-MFP-M125ra.ppd file
warning: Insufficient permission to access file /etc/cups/ppd/HP-LaserJet-Pro-MFP-M125ra.ppd
warning: Could not complete Queue(s) configuration check


Checking for HP Properitery Plugin's....
No plug-in printers are configured.

Diagnose completed...


lsusb命令输出：

Bus 002 Device 009: ID 03f0:222a Hewlett-Packard


sane-find-scanner命令输出：

  # sane-find-scanner will now attempt to detect your scanner. If the
  # result is different from what you expected, first make sure your
  # scanner is powered up and properly connected to your computer.

  # No SCSI scanners found. If you expected something different, make sure that
  # you have loaded a kernel SCSI driver for your SCSI adapter.

found USB scanner (vendor=0x03f0 [Hewlett-Packard], product=0x222a [HP LaserJet Pro MFP M125ra]) at libusb:002:009
could not open USB device 0x04d9/0x0175 at 002:006: Access denied (insufficient permissions)
could not open USB device 0x2109/0x2812 at 002:004: Access denied (insufficient permissions)
could not open USB device 0x0001/0x0000 at 002:003: Access denied (insufficient permissions)
could not open USB device 0x8087/0x0024 at 002:002: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0002 at 002:001: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0003 at 004:001: Access denied (insufficient permissions)
could not open USB device 0x046d/0xc52b at 003:003: Access denied (insufficient permissions)
could not open USB device 0x0461/0x0010 at 003:002: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0002 at 003:001: Access denied (insufficient permissions)
could not open USB device 0x8087/0x0024 at 001:002: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0002 at 001:001: Access denied (insufficient permissions)
  # Your USB scanner was (probably) detected. It may or may not be supported by
  # SANE. Try scanimage -L and read the backend's manpage.

  # Not checking for parallel port scanners.

  # Most Scanners connected to the parallel port or other proprietary ports
  # can't be detected by this program.

  # You may want to run this program as root to find all devices. Once you
  # found the scanner devices, be sure to adjust access permissions as
  # necessary.


打印机无需 hplip 设置即可工作。如何使扫描仪工作？

hp scanner 18.04 hplip
Martin Hope
mature
Asked: 2019-06-08 05:22:25 +0800 CST
  • 2

打印机：HP LaserJet Pro MFP M125ra

操作系统：Ubuntu 18.04.2 LTS

问题：MFU 像打印机一样工作，但不像扫描仪那样工作。

安装了最新的 HPLIP 版本：developers.hp.com 的 3.19.5。

$ hp-setup -i

HP Linux Imaging and Printing System (ver. 3.19.5)
Printer/Fax Setup Utility ver. 9.0

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

(Note: Defaults for each question are maked with a '*'. Press <enter> to accept the default.)


--------------------------------
| SELECT CONNECTION (I/O) TYPE |
--------------------------------

  Num       Connection  Description                                               
            Type                                                                  
  --------  ----------  ----------------------------------------------------------
  0*        usb         Universal Serial Bus (USB)                                
  1         net         Network/Ethernet/Wireless (direct connection or JetDirect)

Enter number 0...1 for connection type (q=quit, enter=usb*) ? 

Using connection type: usb

error: No device selected/specified or that supports this functionality.

XSane 显示错误：

XSane 错误

$ sane-find-scanner 

  # sane-find-scanner will now attempt to detect your scanner. If the
  # result is different from what you expected, first make sure your
  # scanner is powered up and properly connected to your computer.

  # No SCSI scanners found. If you expected something different, make sure that
  # you have loaded a kernel SCSI driver for your SCSI adapter.

found USB scanner (vendor=0x03f0 [Hewlett-Packard], product=0x222a [HP LaserJet Pro MFP M125ra]) at libusb:002:007
could not open USB device 0x045e/0x0800 at 002:006: Access denied (insufficient permissions)
could not open USB device 0x04d9/0x0175 at 002:005: Access denied (insufficient permissions)
could not open USB device 0x2109/0x2812 at 002:003: Access denied (insufficient permissions)
could not open USB device 0x8087/0x0024 at 002:002: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0002 at 002:001: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0003 at 004:001: Access denied (insufficient permissions)
could not open USB device 0x046d/0xc52b at 003:003: Access denied (insufficient permissions)
could not open USB device 0x0461/0x0010 at 003:002: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0002 at 003:001: Access denied (insufficient permissions)
could not open USB device 0x8087/0x0024 at 001:002: Access denied (insufficient permissions)
could not open USB device 0x1d6b/0x0002 at 001:001: Access denied (insufficient permissions)
  # Your USB scanner was (probably) detected. It may or may not be supported by
  # SANE. Try scanimage -L and read the backend's manpage.

  # Not checking for parallel port scanners.

  # Most Scanners connected to the parallel port or other proprietary ports
  # can't be detected by this program.

  # You may want to run this program as root to find all devices. Once you
  # found the scanner devices, be sure to adjust access permissions as
  # necessary.

惠普设备管理器

系统打印机

其他打印机设置

drivers usb hp scanner hplip
Martin Hope
mature
Asked: 2019-06-05 12:34:17 +0800 CST
  • 0

有没有办法在Ubuntu 18.04中安装 Image Viewer 和转换器XnViewMP（或 Xnview 和 XnConverter）？ 其他描述的方式（14.04、16.04、16.10、18.04）似乎对我不起作用。

从如何在 Ubuntu 18.04 中安装 XnViewMP对我不起作用：

$ snap search xnview
No matching snaps for "xnview"
software-installation 18.04 image-viewers
Martin Hope
mature
Asked: 2019-05-12 05:37:30 +0800 CST
  • 21

就我而言，我看到：

~$ sudo lsblk 
NAME                    MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
loop0                     7:0    0 367,3M  1 loop  /snap/clion/69
loop1                     7:1    0    44M  1 loop  /snap/ffmpeg/206
loop2                     7:2    0  14,8M  1 loop  /snap/gnome-characters/258
loop3                     7:3    0 141,8M  1 loop  /snap/skype/60
loop4                     7:4    0  14,8M  1 loop  /snap/gnome-characters/206
loop5                     7:5    0   518M  1 loop  /snap/libreoffice/117
loop6                     7:6    0  45,4M  1 loop  /snap/ffmpeg/403
loop7                     7:7    0 134,3M  1 loop  /snap/icq-im/21
loop8                     7:8    0  53,7M  1 loop  /snap/core18/941
loop9                     7:9    0 169,4M  1 loop  /snap/gimp/113
loop10                    7:10   0 154,6M  1 loop  /snap/chromium/705
loop11                    7:11   0 225,1M  1 loop  /snap/webstorm/90
loop12                    7:12   0   3,7M  1 loop  /snap/gnome-system-monitor/77
loop13                    7:13   0   372M  1 loop  /snap/pycharm-professional/125
loop14                    7:14   0 150,2M  1 loop  /snap/opera/35
loop15                    7:15   0  91,1M  1 loop  /snap/core/6531
loop16                    7:16   0   127M  1 loop  /snap/code/6
loop17                    7:17   0 222,2M  1 loop  /snap/webstorm/86
loop18                    7:18   0 456,4M  1 loop  /snap/wine-platform/128
loop19                    7:19   0 218,1M  1 loop  /snap/gimp/130
loop20                    7:20   0 300,4M  1 loop  /snap/datagrip/45
loop21                    7:21   0   151M  1 loop  /snap/gnome-

...

loop84                    7:84   0  53,7M  1 loop  /snap/core18/731
loop85                    7:85   0 140,7M  1 loop  /snap/gnome-3-26-1604/74
loop86                    7:86   0 150,2M  1 loop  /snap/opera/36
loop87                    7:87   0   368M  1 loop  /snap/clion/70
sda                       8:0    0 931,5G  0 disk  
├─sda1                    8:1    0    80G  0 part  
├─sda2                    8:2    0    68G  0 part  
└─sda4                    8:4    0 783,5G  0 part  

... 

nvme0n1                 259:0    0 238,5G  0 disk  
├─nvme0n1p1             259:1    0   512M  0 part  /boot/efi
├─nvme0n1p2             259:2    0   732M  0 part  /boot
└─nvme0n1p3             259:3    0 237,3G  0 part  
  └─nvme0n1p3_crypt     253:0    0 237,3G  0 crypt 
    ├─ubuntu--vg-root   253:1    0 236,3G  0 lvm   /
    └─ubuntu--vg-swap_1 253:2    0   976M  0 lvm   [SWAP]

但对我有用的是物理磁盘，如sda*、nvme* ..

是否可以使用某些参数临时隐藏循环*虚拟设备？或者向我推荐另一个命令来观看我的设备。

command-line partitioning
Martin Hope
mature
Asked: 2019-05-09 11:46:06 +0800 CST
  • 2

看起来某些 Ubuntu 18.04 更新禁用了所有非系统应用程序托盘图标。现在应该通过单击关闭(x)标题栏的按钮来最小化那些应用程序。在此列表中，我的所有应用程序都带有系统托盘图标，例如：Skype、ICQ、Telegram。+ 没有任何状态指示。

例子：

顶部栏、顶部面板、破折号、Skype

如您所见，上面的示例中没有 Skype 图标。

icons system-tray 18.04
Martin Hope
mature
Asked: 2019-05-09 06:31:47 +0800 CST
  • 5

当我单击活动时，我只能看到默认的 GNOME Dock：

在此处输入图像描述 在此处输入图像描述

我已经在尝试做的事情：

  1. 我尝试删除 GNOME 文件，例如.gnome .gnome2 .gconf .gconfd .metacity
  2. 我使用Gnome Tweaks GUI禁用了所有已安装的 Gnome 扩展。
  3. 我将所有Gnome Tweaks都“重置为默认值” 。
  4. 我重置了 gnome 中的所有更改dconf reset -f /org/gnome/
  5. 我尝试安装sudo apt install gnome-shell-extension-ubuntu-dock但收到消息它已经安装：gnome-shell-extension-ubuntu-dock is already the newest version (0.9.1ubuntu18.04.3).
  6. 成千上万的重新启动和注销的..
gnome-shell ubuntu-dock 18.04
Martin Hope
mature
Asked: 2019-04-25 11:52:43 +0800 CST
  • 0

Ubuntu 18.04 LTS，GNOME 3.28.2

当我尝试从控制台升级它时，收到：

~$ sudo apt update
 ...

~$ sudo apt upgrade 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
3 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] 
Setting up keyboard-configuration (1.178ubuntu2.8) ...
Error loading new keyboard description
/usr/bin/ckbcomp: Can not find file "symbols/layout" in any known directory
dpkg: error processing package keyboard-configuration (--configure):
 installed keyboard-configuration package post-installation script subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of console-setup-linux:
 console-setup-linux depends on keyboard-configuration (= 1.178ubuntu2.8); however:
  Package keyboard-configuration is not configured yet.

dpkg: error processing package console-setup-linux (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of console-setup:
 console-setup depends on console-setup-linux | console-setup-freebsd | hurd; however:
  Package console-setup-linux is not configured yet.
  Package console-setup-freebsd is not installed.
  Package hurd is not installed.
 console-setup depends on keyboard-configuration (= 1.178ubuntu2.8); however:
  Package keyboard-configuration is not configured yet.

dpkg: error processing package console-setup (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          No apport report written because the error message indicates its a followup error from a previous failure.
 Errors were encountered while processing:
 keyboard-configuration
 console-setup-linux
 console-setup
E: Sub-process /usr/bin/dpkg returned an error code (1)

从 AskubUntu 搜索解决方案我发现并尝试了几个命令，例如：

~$ sudo dpkg --configure -a
~$ sudo dpkg --configure -a --force-depends

结果，我将错误减少到单个Errors while processing: keyboard-configuration：

~$ sudo apt upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] 
Setting up keyboard-configuration (1.178ubuntu2.8) ...
Error loading new keyboard description
/usr/bin/ckbcomp: Can not find file "symbols/layout" in any known directory
dpkg: error processing package keyboard-configuration (--configure):
 installed keyboard-configuration package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 keyboard-configuration
E: Sub-process /usr/bin/dpkg returned an error code (1)

如何解决此keyboard-configuration错误？

keyboard upgrade dpkg dependencies 18.04
Martin Hope
mature
Asked: 2019-01-14 23:56:01 +0800 CST
  • 23

我看到一个空的下拉框，当前键盘布局的语言代码应该在其中。

重现错误：锁定屏幕或注销并重新登录。

gnome shell 上的键盘布局指示器的屏幕截图

当我尝试使用我的密码登录时，我在锁定屏幕上也得到了相同的行为：

gdm 上的键盘布局指示器的屏幕截图

在我尝试了解决方法（如下）后，只要我输入密码的第一个字符，登录屏幕上的语言代码就会消失。

解决方法（非永久性）：使用键盘 ( Super+space) 或鼠标进行切换。

系统信息：Ubuntu 18.04.1 LTS，GNOME 3.28.2。

系统信息

请在错误报告中指出是否也影响了您。

keyboard keyboard-layout indicator gnome-shell
Martin Hope
mature
Asked: 2018-12-28 01:07:15 +0800 CST
  • 0

是否有用于快速启动 gnome-calculator 的预定义键盘快捷键？

当我尝试从设置中设置自定义（例如Ctrl++ Alt）5时，它们对我不起作用：

在此处输入图像描述 在此处输入图像描述

shortcut-keys 18.04 gnome-calculator